The blue-chip index’s worst performer was Pfizer, down 2.1 percent, after the drugmaker and Johnson & Johnson announced they were ending trials of an Alzheimer’s disease treatment. J&J fell 0.8 percent.

Do-it-yourself retailer Home Depot rose 0.8 percent after revealing it was buying US Home Systems, a kitchen and bath products and services firm, in a $93.4 million cash deal. USHS soared 38.3 percent to $12.53.